SEOUL, South Korea — He clapped and he smiled, even posing for a group photo with a K-pop band.

韩国首尔——他鼓掌，他微笑，他甚至摆好姿势和一个韩国流行乐队合照。

The appearance by North Korea’s leader, Kim Jong Un, on Sunday at a concert by South Korean musicians in Pyongyang was all the more unusual because his authoritarian government has been struggling to stave off what it sees as an infiltration of the South’s pop culture among his isolated people.

It was the first time a North Korean leader watched a South Korean musical performance in the North’s capital.

这是朝鲜领导人首次在朝鲜首都观看韩国音乐演出。

The performances by the South Korean troupe that flew in Saturday with great fanfare to Pyongyang were done in the name of international diplomacy.

这些韩国乐团在平壤得到了大肆宣扬，他们于周六飞抵平壤，这次表演是以国际外交的名义进行的。

The show occurred just weeks before Kim is scheduled to meet with South Korea’s president, Moon Jae-in, at a border village on April 27, and before a planned summit meeting with President Donald Trump in May.

这场演出几周之后，按照计划，金正恩就将于4月27日在一个边境村庄会见韩国总统文在寅，并将于5月与唐纳德·特朗普总统举行领导人会晤。

They were the first South Korean singers to perform in North Korea in more than a decade. Their visit reciprocated a North Korean art troupe’s performances in South Korea during its Winter Olympics in February. Moon watched one of the North Korean performances.

他们是十几年来首次在朝鲜表演的韩国歌手。这次访问是对朝鲜艺术团2月在冬奥会期间演出的回应，当时文在寅观看了朝鲜艺术团的一场演出。

Kim and Ri, a former singer, were among hundreds of North Koreans who filled the 1,500-seat theater to watch the South Korean singers, including older crooners, gelled rockers and K-pop starlets.

On Sunday evening, thunderous clapping erupted when Kim and his wife entered the concert hall and seated themselves in a second-floor balcony, according to pool reports from South Korean journalists and officials.

根据韩国记者和官员的各种报道，周日晚上，当金正恩和妻子走进音乐厅，在二楼包厢入座时，剧场中掌声雷动。

Attention was focused on how Kim would react to the pop singers, particularly Red Velvet. The five-member girl group is typical of South Korean girl groups — known for their chirpy, bubble-gum harmonies and sexy choreography.

人们的注意力都集中在金正恩对流行歌手的反应上，尤其是“红丝绒”。这个五人女子组合是典型的韩国女团——以欢快甜美的和声与性感的编舞著名。

Their tunes are so infectious that the South Korean military has broadcast them across the border in a psychological war against North Korean soldiers. The North used to threaten to direct its artillery at the loudspeakers, warning of an “all-out war” if the South didn’t turn them off.

South Korean officials said the North did not attempt to reject any of the South Korean song lineup or change the pop stars’ lyrics or risqué dance moves.

韩国官员表示，朝鲜从未试图拒绝韩国安排的任何歌曲节目，或者是改动流行明星的歌词以及有伤风化的舞蹈动作。

(But apparently, even North Korea had a limit to how far it would go in accepting K-pop. South Korean officials said the North had rejected their suggestion that the global star Psy, the singer famous for his “Gangnam Style” global hit, be included in the visit.)

“Please tell President Moon how good this kind of exchange is. I know there has been attention to whether I will come and see Red Velvet,” Kim was quoted as telling South Korean officials. “I thank you for bringing this gift to Pyongyang citizens.”

Kim’s acceptance of Red Velvet and South Korean pop culture was striking because his government has stepped up a crackdown on DVDs and computer thumb drives containing South Korean pop songs, movies and TV dramas smuggled from China, calling for establishing “mosquito nets” to keep out “decadent capitalist influence.”

Defectors from the North have said that those who were caught selling or watching South Korean K-pop music videos could be sent to prison camps.

来自朝鲜的脱北者表示，贩卖或观看韩国流行音乐视频被捕的人可能会被送往集中营。

Kim, who studied in Switzerland as a teenager, has tried of late to present himself as more flexible, at least among the loyal elite citizens living in Pyongyang. North Korea’s Moranbong Band, often said to be Kim’s favorite girl group, has performed in short skirts and high heels, featuring theme songs from Hollywood films.